• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.391-395
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• 2002

Computer security is considered important due to the side effect generated from the expansion of computer network and rapid increase of use of computers. A attach of intruders using a vulnerability of operating system, protocol and application programs. And so, The attack methods is to be high technology and professional. Thus It must be necessity that we necessary a solution to structure, management for framework of information technology. This paper develope intrusion detecting system for separating intruders form critical system and design IDS model and implementation of it.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.438-441
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• 2015

패킷 캡쳐는 IDS 및 IPS에서 가장 중요한 개념이다. 악성 패킷에 대한 시그니쳐를 탐지하여 사전에 차단할 수 있기 때문이다. OpenFlow를 이용하여 네트워크 패킷 요청 혹은 응답을 특화된 서버, 즉 인터넷검역소를 거친 후 종단 사용자에게 전달할 수 있다. SDN의 특성을 활용하여 종단 사용자는 어떤 프로그램도 설치하지 않고도 네트워크에 연결되어 있는 것만으로 가장 빠른 보안을 적용받을 수 있다. 본 논문에서는 SDN상에서 네트워크 검역을 위해 오픈 소스 Bro IDS를 이용하여 패킷을 캡쳐하는 방법과 발생한 문제와 그에 대한 해결법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.407-410
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• 2013

전 세계적으로 초고속 인터넷이 보급화 되고 대중화 되는 현재 컴퓨터 온라인 게임 산업뿐만 아니라 스마트폰 모바일 게임 산업이 빠르게 성장하면서 고정된 장소에서 게임하는 시대는 가고 이동 중 게임하는 시대가 열렸다. 이와 동시에 모바일 게임 트래픽 또한 점차 증가되고 있는 실정이다. 본 논문은 모바일 게임의 트래픽 분석을 위해 서로 다른 특성의 게임인 애니팡과 드래곤 플라이트를 이용하여 모바일 속도 측정 프로그램인 벤치비로 트래픽 변동 상황을 정리하고 tPacketCapture 프로그램과 네트워크 측정 분석기인 Wireshark로 일정한 시간 간격을 두고 총 패킷의 수와 전송되는 패킷의 크기 등에 대한 체계적인 네트워크 데이터를 분석하여 시간적 제한이 있는 보드 퍼즐 게임의 특성을 지닌 애니팡은 게임 진행상에서 빈번하게 데이터 패킷이 송 수신 되고 시간적 제한이 없는 슛팅 게임의 특성을 지닌 드래곤 플라이트는 게임 시작과 종료 지점에서만 주로 데이터 패킷이 송 수신 된다는 것을 알 수 있었다. 이러한 스마트폰 모바일 게임의 트래픽 분석은 향후 모바일 게임 네트워크의 성능 평가나 다른 모바일 게임의 설계 및 개발 등에 활용 될 수 있을 것이다.

• Therapeutic Science for Rehabilitation
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• v.12 no.2
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• pp.85-98
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• 2023

Objective : We investigated the efficacy of an artificial intelligence computerized cognitive training program using motion capture to identify changes in cognition, depression, and quality of life in older adults with mild cognitive impairment. Methods : A total of seven older adults (experimental group = 4, control group = 3) participated in this study. During the COVID-19 period from October to December 2021, we used a program, "MOOVE Brain", that we had developed. The experimental group performed the program 30 minutes 3×/week for 1 month. We analyzed patients scores from the Korean version of the Mini-Mental State Examination-2, the Consortium to Establish a Registry for Alzheimer's Disease Assessment Packet for Daily Life Evaluation, the short form Geriatric Depression Scale, and Geriatric Quality of Life Scale. Results : We observed positive changes in the mean scores of the Stroop Color Test (attention), Stroop Color/Word Test (executive function), SGDS-K (depression), and GQOL (QoL). However, these changes did not reach statistical significance for each variable. Conclusion : The study results from "MOOVE Brain" can help address cognitive and psychosocial issues in isolated patients with MCI during the COVID-19 pandemic or those unable to access in-person medical services.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.8
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• pp.23-32
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• 2007

We propose a group-based security scheme for hierarchical wireless sensor networks. We model the network for secure routing with 3-tier sensor network comprised of three types of nodes: Base Station, Group Dominator and ordinary Sensor Nodes. Group-based deployment is performed using Gaussian (normal) distribution and show that more than 85% network connectivity can be achieved with the proposed model. The small groups with pre-shared secrets form the secure groups where group dominators form the backbone of the entire network. The scheme is devised for dealing with sensory data aggregated by groups of collocated sensors; i.e., local sensed data are collected by the dominating nodes and sent an aggregated packet to the base station via other group dominators. The scheme is shown to be light-weight, and it offers a stronger defense against node capture attacks. Analysis and simulation results are presented to defend our proposal. Analysis shows that robustness can significantly be improved by increasing the deployment density using both the dominating and/or ordinary sensor nodes.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.1
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• pp.75-84
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• 2017

It becomes more and more more important for the storage that supports high speed recording and stable access from network environment. As one field of basic science which produces massive astronomical data, VLBI(: Very Long Baseline Interferometer) is now demanding more data writing performance and which is directly related to astronomical observation with high resolution and sensitivity. But most of existing storage are cloud model based for the high throughput of general IT, finance, and administrative service, and therefore it not the best choice for recording of big stream data. Therefore, in this study, we design storage system optimized for high performance of I/O and concurrency. To solve this problem, we implement packet read and writing module through the use of libpcap and pf_ring API on the multi core CPU environment, and build a scalable storage based on software RAID(: Redundant Array of Inexpensive Disks) for the efficient process of incoming data from external network.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.7
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• pp.3465-3479
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• 2017

Information-Centric Vehicular Ad Hoc Network (IC-VANET) is a promising network architecture for the future intelligent transport system. Video streaming applications over IC-VANET not only enrich infotainment services, but also provide the drivers and pedestrians real-time visual information to make proper decisions. However, due to the characteristics of wireless link and frequent change of the network topology, the packet loss seriously affects the quality of video streaming applications. In this paper, we propose a REceiver-Driven loss reCOvery Mechanism (REDCOM) to enhance video dissemination over IC-VANET. A Markov chain based estimation model is introduced to capture the real-time network condition. Based on the estimation result, the proposed REDCOM recovers the lost packets by requesting additional forward error correction packets. The REDCOM follows the receiver-driven model of IC-VANET and does not require the infrastructure support to efficiently overcome packet losses. Experimental results demonstrate that the proposed REDCOM improves video quality under various network conditions.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.9B
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• pp.604-611
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• 2007

In this paper, we present an analysis of the throughput when there are multiple piconets and WLAN sharing the ISM bands. The analysis takes channel propagation characteristics and the capture effect. We also propose an algorithm which can be used to reduce the amount of channel scanning. By using traffic prediction of the interfering WLAN, we are able to maintain a reasonable performance in terms of fraction of time channel is wasted due to collisions or unused channel. Through computer simulation, we demonstrate that the proposed algorithm achieves reduced scanning frequency.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.4C
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• pp.282-294
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• 2002

The modern telecommunication networks are composed of various network-type and are managed by various management technologies, such as TMN, SNMP, TINA etc. Furthermore, the network user's needs of real-time multimedia services are rapidly increasing. In order to guarantee the user-requested quality-of-service(QoS) and keep the network utilization at maximum, it is required to manage the network performance continuously after the network is deployed. The performance management function should provide the useful information for the network expansion and the capacity reallocation in the future. In this paper, we propose a DPE-based performance management architecture for the integrated management of the heterogeneous network elements with TMN and SNMP. We propose an approach to provide the Intranet traffic monitoring and analysis function using layered network management concept and distributed processing technology. The proposed architecture has been designed and implemented based on multiprocess and multithread structure to support concurrent processing. To manage the traffic according to the Intranet service categories, we implemented an ITMA(Intelligent Traffic Monitoring Agent) with packet capture library. With the proposed architecture, we could measure and analyze the real Intranet traffic of Yeungnam University.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.5
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• pp.344-354
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• 2013

In this paper, In order to solve the traffic of the SNS to be executed on smartphone, we propose the design of the SNS integrated gateway server. Also, we capture the payload size in a variety of methods to send the MQTT protocol and QoS level of MQTT protocol for communication between the client and the Gateway. And we present the results and analysis of packet loss and end-to-end delay. By using analysis proposed, we present the results of the integrated SNS Gateway push notification protocol design.